Interesting...
You might try remounting /var with data=ordered and see if the problem goes away. I'm guessing it will.
I would actually recommend doing this, as I experienced regular crashes with data=journal under heavy load in our test lab. Under moderate load, I only saw the "Unexpected dirty buffer..." messages, but when I really cranked up the load (45 emails per second through postfix + spam filter, 2000 mysql queries per second on a 1GB table, syslogging maillog to disk), I was getting kernel panics, 100% reproducible within a few minutes of testing. Because of these problems, I'm sticking to data=ordered for production, even though I want data-journaling. :)
Please post those traces to the list so the developers can fix this.
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